The fate of carbon in growing fish: an experimental study of isotopic routing.

The application of stable isotope analysis to ecology requires estimating the contribution of different isotopic sources to the isotopic signatures of an animal's tissues using mixing models. These models make the physiologically unrealistic assumption that assimilated nutrients are disassembled into their elemental components and that these atoms are then reassembled into biomolecules. We quantified the extent to which mixing models yield erroneous results with an experiment using Nile tilapia (Oreochromis niloticus).

Never in care: characteristics of HIV-infected crack cocaine users in 2 US cities who have never been to outpatient HIV care.

Background: There are very limited data available of the correlates of HIV-infected crack users who have never been to HIV care.

Methods: Interviews were conducted at bedside with HIV-infected crack cocaine users who were recruited from the inpatient wards at Jackson Memorial Hospital in Miami, FL, and Grady Memorial Hospital in Atlanta, GA, between August 2006 and July 2009. Participants were asked about their sociodemographic characteristics, drug use, drug/alcohol treatment history, use of HIV care, perceived social support, and mental health status.

Assessment of ECG interval and restitution parameters in the canine model of short QT syndrome.

Introduction: The short QT syndrome (SQTS) is characterized by a short QT interval resulting from accelerated ventricular repolarization, and may be associated with ventricular fibrillation but not torsades de pointes. There are abundant data on the adverse effects of long QT, but knowledge of SQTS is sparse. The aim of this study was to examine whether analyses of several ECG biomarkers (QT, QTcB, QTcF, QTcV, QT(btb), and QT(RR1000)) and dynamic restitution of the beat-to-beat QT-TQ relationship (TQ(min), %QT/TQ ratio>1, QT/TQ ratio(max)) can be used to assess ECG changes in conscious dogs.

Predictors of success with highly active antiretroviral therapy in an antiretroviral-naive urban population.

Abstract Predictors of successful virologic, immunologic, and clinical response with combined antiretroviral therapy (cART) containing a boosted protease inhibitor or a nonnucleoside reverse transcriptase inhibitor were analyzed among an antiretroviral naive (ARV-naive) urban cohort. Measures of success included virologic suppression [HIV-1 viral load (VL) <400 copies/ml], an increase in CD4(+) T cells from baseline of >100 cells/microl, and lack of development of an AIDS-defining illness at 24 and 48 weeks after cART initiation. Two hundred and eighty-seven ARV-naive patients were included in this cohort, of which 76.

Depressive symptoms and food insufficiency among HIV-infected crack users in Atlanta and Miami.

Depression contributes to worse general and HIV-related clinical outcomes. We examined the prevalence of and factors associated with depressive symptomatology among HIV-infected crack cocaine users recruited for Project HOPE (Hospital Visit is an Opportunity for Prevention and Engagement with HIV-positive Crack Users). We used multiple logistic regression to determine sociodemographic correlates associated with screening in for depression.

Food insufficiency among HIV-infected crack-cocaine users in Atlanta and Miami.

Objective: To measure the occurrence and correlates of food insufficiency among HIV-infected crack-cocaine users in Atlanta and Miami, USA.

Design: Non-probability cross-sectional sample.

Setting: Inner-city hospitals in Atlanta and Miami.

An HIV/AIDS fellowship program for minority physicians.

The human immunodeficiency virus (HIV)/AIDS epidemic disproportionately affects African Americans and Latinos in the United States, but there are limited numbers of minority physicians providing primary medical care to these patients. An HIV Medicine Association (HIVMA) Minority Clinical fellowship began training the first cohort of minority physicians in July 2007 to help provide care in the face of these health disparities. This report chronicles the experience of Dr Loida Bonney as a fellow caring for people living with HIV/AIDS at the Grady Health System in urban Atlanta, Georgia, and demonstrates that such fellowships can be successful mechanisms to train physicians with expertise in HIV medicine.

HIV-associated resources on the internet.

The Internet provides easy, widespread access to new developments in the field of medicine. The pace of HIV-related research is rapid and has global relevance, making the Internet a particularly well-suited technology for dissemination of information. The number of sites offering HIV-related information is vast, and the quality is variable.

Commentary: IDSA guidelines for improving the teaching of preclinical medical microbiology and infectious diseases.

Preclinical microbiology and infectious diseases courses too often primarily depend on PowerPoint lectures and notes, combined with multiple-choice tests, as their primary teaching tools. This strategy sets low expectations for students, encouraging short-term memory and discouraging understanding and long-term memory. These methods also fail to stimulate active participation, collaborative learning, and two-way communication with the professor, and they do not respect the students' diverse talents and ways of learning.

An extended model of reasoned action to understand the influence of individual- and network-level factors on African Americans' participation in HIV vaccine research.

In the United States, the number and proportion of HIV/AIDS cases among black/African Americans continue to highlight the need for new biomedical prevention interventions, including an HIV vaccine, microbicide, or new antiretroviral (ARV) prevention strategies such as pre-exposure prophylaxis (PrEP) to complement existing condom usage, harm reduction methods, and behavioral change strategies to stem the HIV epidemic. Although black/African Americans are disproportionately impacted by HIV/AIDS, their participation in HIV clinical research continues to have unique challenges. We theorize that interaction among multilevel factors creates ideal alignment for minority participation in HIV clinical studies.

Pandemic influenza as 21st century urban public health crisis.

The percentage of the world's population living in urban areas will increase from 50% in 2008 to 70% (4.9 billion) in 2025. Crowded urban areas in developing and industrialized countries are uniquely vulnerable to public health crises and face daunting challenges in surveillance, response, and public communication.

The yellow fever virus vaccine induces a broad and polyfunctional human memory CD8+ T cell response.

The live yellow fever vaccine (YF-17D) offers a unique opportunity to study memory CD8(+) T cell differentiation in humans following an acute viral infection. We have performed a comprehensive analysis of the virus-specific CD8(+) T cell response using overlapping peptides spanning the entire viral genome. Our results showed that the YF-17D vaccine induces a broad CD8(+) T cell response targeting several epitopes within each viral protein.

Comparative cell-mediated immunogenicity of DNA/DNA, DNA/adenovirus type 5 (Ad5), or Ad5/Ad5 HIV-1 clade B gag vaccine prime-boost regimens.

Background: We report composite results from the Merck phase I program of near-consensus clade B human immunodeficiency virus (HIV) type 1 gag vaccines.

Methods: Healthy HIV-uninfected adults were enrolled in 6 blinded placebo-controlled studies evaluating the immunogenicity of (1) a 4-dose regimen of a DNA vaccine, (2) a 3-dose priming regimen of the DNA vaccine with a booster dose of an adenovirus type 5 (Ad5)-vectored vaccine, or (3) a 3-dose regimen of the Ad5 vaccine. The DNA plasmid was provided with or without an aluminum phosphate or CRL1005 adjuvant.

Safety of influenza vaccination during pregnancy.

The Centers for Disease Control and Prevention Advisory Committee on Immunization Practices recommends routine influenza vaccination for all women who are or will be pregnant during the influenza season. During seasonal influenza epidemics, during previous pandemics, and with the current influenza A (H1N1) pandemic, pregnancy places otherwise healthy women at increased risk for serious complications from influenza, including death. Inactivated influenza vaccine can be safely and effectively administered during any trimester of pregnancy.

High mortality among patients with positive blood cultures at a children's hospital in Tbilisi, Georgia.

Background: The etiology and outcomes of blood-stream infections (BSI) among paediatric patients is not well described in resource-limited countries including Georgia.

Methodology: Patients with positive blood cultures at the largest paediatric hospital in the country of Georgia were identified by review of the medical and laboratory records of patients who had blood for cultures drawn between January 2004 and June 2006.

Results: Of 1,693 blood cultures obtained during the study period, 338 (20%) were positive; of these, 299 were included in our analysis.

Demographic, psychological, and behavioral modifiers of the Antiretroviral Treatment Access Study (ARTAS) intervention.

The present study sought to identify demographic, structural, behavioral, and psychological subgroups for which the Antiretroviral Treatment Access Study (ARTAS) intervention had stronger or weaker effects in linking recently diagnosed HIV-positive persons to medical care. The study, carried out from 2001 to 2003, randomized 316 participants to receive either passive referral or a strengths-based linkage intervention to facilitate entry into HIV primary care. The outcome was attending at least one HIV primary care visit in each of two consecutive 6-month periods.

Myocardial electrical activity does not affect myocardial electrical impedance measurements.

Objective: Myocardial electrical impedance (MEI) has shown to be an effective indicator of myocardial ischemia. We have previously developed a novel monitor for measuring MEI in near-real time. The object of this study was to test whether drug-induced changes in the frequency of the periodic myocardial electrical activity, as measured by the heart rate (HR), affect MEI measurements made with our monitor.

Dietary and isotopic specialization: the isotopic niche of three Cinclodes ovenbirds.

By comparing the isotopic composition of tissues deposited at different times, we can identify individuals that shift diets over time and individuals with constant diets. We define an individual as an isotopic specialist if tissues deposited at different times have similar isotopic composition. If tissues deposited at different times differ in isotopic composition we define an individual as an isotopic generalist.

Hospitalized HIV-infected patients in the era of highly active antiretroviral therapy.

We interviewed 1038 HIV-positive inpatients in public hospitals in Miami, Florida, and Atlanta, Georgia, to examine patient factors associated with use of HIV care, use of antiretroviral therapy, and unprotected sexual intercourse. Multivariate analyses and multiple logistic regression models showed that use of crack cocaine and heavy drinking were associated with never having had an HIV-care provider, high-risk sexual behavior, and not receiving antiretroviral therapy. Inpatient interventions that link and retain HIV-positive persons in primary care services could prevent HIV transmission and unnecessary hospitalizations.